Effect of Ammonium Nitrate and Combustible Binder on the Ignition Characteristics of High-Energetic Materials Containing Aluminum Borides
A. G. Korotkikh1,2, I. V. Sorokin3, V. A. Arkhipov2
1National Research Tomsk Polytechnic University, Tomsk, 634050 Russia
2National Research Tomsk State University, Tomsk, 634050 Russia
3Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: high energy material, aluminum, boron, aluminum boride, decomposition, ignition, laser radiation
Abstract
This paper presents results of an experimental study of the processes of thermal decomposition and ignition of high-energy materials (HEMs) containing an oxidizing agent, a combustible agent, and dispersed additives of aluminum, aluminum borides (AlB2 and AlB12), and amorphous boron. A Netzsch STA 449 F3 Jupiter thermal analyzer and an experimental testbench, which includes a continuous-wave CO2 laser, are used to investigate the response and ignition characteristics of two basic HEM compositions based on AP/SKDM/Me and PCA/AN/MPVT/Me at different heating rates. It has been established that ammonium nitrate at low heat flux densities (q < 130 W/cm2) decomposes and melts, forming a liquid layer on the reaction surface and increasing the delay time of the emergence of a HEM flame containing Al, AlB2, and AlB12. With an increase in the heat flux density, the effect of the liquid layer on the reaction surface of the sample decreases due to the rising surface temperature, the outflow rate of gaseous decomposition products, and the layer evaporation.
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